If an entire reorganized legion were to face the power that Leonard Churchill currently comprehended, there wouldn't be anyone who could withstand it.
"Oh, the timing is off..."
The moment this thought flashed through Leonard's mind, he guessed the reason why.
Counting the time, the Titan Research Institute developed the finished mechanical core in the Taren's End Period.
Perhaps the dynasty had collapsed before they could start mass production.
And then they used it to guard the tomb?
It was much later that Leonard learned the more important reason was that the empire was already tottering in the last years of Taren, and 'Mad King' Auduin, fearing that such power could overthrow his rule, sealed off these top-level technologies.